Effect of Three Pole Auto-Reclose to Power System Transient Stability (Case Study: Jawa Timur and Bali System)

One of the way to maintain power system reliability is by maintaining transmission lines reliability using Auto-reclose (AR). If fault occurred in a transmission line, then relay will ordered the transmission line to open. If the fault is temporary then after a few milliseconds the transmission line will closed again automatically due to implementation of AR. Auto-reclose employ in power system could be Single Pole Auto-reclose (SPAR) and Three Pole Auto-reclose (TPAR) depend on system necessity. Since the non-single phase temporary fault In Regional of Jawa Timur and Bali area significantly increase, then it is necessary to install TPAR in that system, especially transmission lines that serves as outlet of power plant. As known, utilization of TPAR may impact the power system transient stability, therefore this paper will analyze that effect. Study conducted in all transmission lines which are outlet of power plant in Jawa Timur and Bali system. Simulation results show that implementation of TPAR in transmission lines will influence system transient stability depends on system condition. After utilization of TPAR most of simulation scenario show that system remaining stable after the temporary fault occurred. Only one condition shows transient instability.